Planetary gearbox, 8:1 reduction, 50 N.m continuous — what it means for your line
The GBX0800080704F is a straight-tooth planetary gearbox, 80 mm diameter, designed to step down motor speed by a factor of 8:1 while delivering 50 N.m continuous output torque at 100 rpm and 30 °C ambient. Efficiency sits at 94 %, meaning about 6 % of input power is lost as heat through the gear train — a solid figure for a straight-tooth planetary, where sliding losses are higher than in helical designs. Rated service life is 30,000 hours at 100 rpm and 30 °C, with the gearbox lubricated for life — no oil changes, no maintenance schedule beyond shaft seal checks.
Load ratings and overhung loads — sizing the application
Maximum output torque peaks at 80 N.m (708 lbf.in) at 100 rpm, 30 °C — this is the short-duration peak before the gear set yields, not the continuous rating. Maximum radial force Fr is 650 N at mid-shaft, rated for the full 30,000-hour service life at 100 rpm and 30 °C; push it to 950 N and the life drops to 10,000 hours. Maximum axial force Fa is 1200 N for 10,000-hour life, derating to 900 N if you need the full 30,000-hour window — the thrust bearing is the limit here. Torsional rigidity is 6 N.m/arcmin, and maximum backlash is 9 arcmin — that is a standard-precision grade, not a zero-backlash servo gearbox; expect some positional play under reversing loads.
Obsolete — sourcing through independent channels
Available through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ. No pin-compatible drop-in replacement from Schneider's current GBX catalog — a different frame or ratio will change the mounting footprint and output speed.